2017-06-08 14:37:50,769 INFO [PlaylistMaintainerWorker] Started looking for playlist changes2017-06-08 14:38:50,487 WARN [FeedUpdaterWorker] An error occured while trying to parse an online resouce requiring a plugin, provide the plugin or remove the resource: No plugin for web resource brainforge://t:/temp/temp.pxf has been found.2017-06-08 14:38:50,488 WARN [FeedUpdaterWorker] An error occured while trying to parse an online resouce requiring a plugin, provide the plugin or remove the resource: No plugin for web resource brainforge://foo has been found.

Ok, reproduced it. The problem is that your feed Url is not URL, but a URI. So you need to implement extractorMatches() and extractItems() that take URI instead of URL, and also implement the URL versions of these that just throw exceptions. Like this: